• Structural Engineering and Mechanics
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• 제32권1호
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• pp.167-178
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• 2009

Initial imperfections, such as initial deflection or remaining stress, cause deterioration of buckling strength of structures. The Koiter imperfection sensitivity law has been extended to describe the mechanism of reduction for structures. The extension is twofold: (1) a number of imperfections are considered, and (2) the second order (minor) imperfections are implemented, in addition to the first order (major) imperfections considered in the Koiter law. Yet, in reality, the variation of external loads is dominant over that of imperfection. In this research, probabilistic evaluation of buckling loads against external loads subjected to probabilistic variation is conducted by extending the concept of imperfection sensitivity. A truss arch subjected to dead and live loads is considered as a numerical example. The mechanism of probabilistic variation of buckling strength of this arch is described by the proposed method, and its reliability is evaluated.

• 대한안전경영과학회지
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• 제9권1호
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• pp.51-63
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• 2007

It is noted that the disaster such as fire, explosion, collapse has been rapidly increased caused by strength deterioration of steel structures at petrochemical plant during fire. In this regard, it is stressed out that the legal requirement for fire proofing for steel structures at petrochemical plant should be carefully reviewed since the current legal requirement such as Industrial Safety & Health Law, Architectural Law has a conflict and different way of approach. In addition, it is our point of view that the present law should be revised to consolidate into single law including engineering design criteria to reflect unreasonable legal requirement. It is further our point of view that the performance certificate for fire proofing like UL-1709, basis of maintenance should be appropriately and reasonably provided in line with global practice.

• 한국전산구조공학회논문집
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• 제26권4호
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• pp.275-281
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• 2013

본 논문에서는 유전알고리즘을 사용하여 철근콘크리트 구조물의 최적 지진설계를 효율적으로 수행하기 위해 클러스터를 사용하는 경우 확장성을 확인하였다. 클러스터를 구성하는 코어프로세서의 개수를 증가시키면서 유전알고리즘의 각 세대에 소요되는 시간의 감소를 관찰하였다. 단일 퍼스널 컴퓨터의 구성을 분류한 후, wall-clock time과 암달의 법칙으로 예상된 값을 비교하여 예상되었던 병목현상을 확인하였다. 이에 클러스터의 확장성에서 복합적인 요인에 의한 경향을 확인할 수 있었다. 병목현상의 물리적인 요인과 알고리즘 측면에서의 요인을 구분하기 위해 유전알고리즘의 개채수를 나누어 실험을 수행하여 결과를 확인하였다.

• 한국조경학회지
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• 제29권5호
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• pp.115-124
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• 2001

The purpose of this study is to examine the rightness of establishing the Essential Act of Landscape Architecture in Korea and to present the legal phase, the legislative system and the construction of a contents at the expected enactment of it. It is necessary to point out the problems of the various fields of landscape architecture and to propose the solutions of them. The contents of the study are as follows, 1 . The number of the regulations related to landscape architecture is a good reason for which the field of landscape architecture is worth being included to the positive law. 2. The problems by items(ordinance, engineer, contract, planning, design and supervision, construction, maintenance, plant and planting, material, aesthetics and sight, environmental conservation and ecology, right and penal regulations) to the domestic related regulations being at issue and the remedies for it shall be considered at the enactment of the Essential Act of Landscape Architecture. 3. The number of the domestic regulations being related to landscape architecture which have a term of\` the Essential Act∼\`is 5. 4. The Essential Act of Landscape Architecture is the separate Essential Act welch defines the scope of landscape architecture as construction works and controls the business essentially. 5. The meaning and character of the Essential Act of Landscape Architecture was examined and the reasons for that essential act were recognized in point of the legal, landscape architectural and educational systems. 6. The creation of new official landscape architectural organization is a reason to justify the enactment of the Essential Act of Landscape Architecture. 7. The legal phase, the legislative system and the construction of a contents of the Essential Act of Landscape Architecture ware presented and this act shall conform to such as the legal system of the Architectural Act, the Essential Act of the Construction Industry and so on. The result of this study will be the basic materials for the creation of the Essential Act of Landscape Architecture.

• 한국농촌건축학회논문집
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• 제22권4호
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• pp.87-95
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• 2020

People with disabilities are an important part of society. The world has a huge population of disabled people. Therefore, it is important to study the establishment and improvement of the disability welfare law. To carry forward the humanitarian spirit and develop the cause of the disabled is a signㄴ of social civilization. Improving the welfare system for the disabled is conducive to social progress. Disabled people have the same right to pursue a happy life as non-disabled people. Now, South Korea, China and Japan all have disability welfare laws. But the content of welfare law is not the same. China's welfare law for the disabled is also very detailed, but there are many problems. Such as education, medical care and so on. Therefore, through this study, to understand the perfect disabled persons' system in other countries, will play a positive role in the development of China's disabled persons' welfare law in the future. By comparing the welfare laws of the three countries, we can learn from each other and make progress. To contribute to the development of the cause of the disabled.

• Structural Engineering and Mechanics
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• 제38권4호
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• pp.443-457
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• 2011

The loss of strength in a structure as a result of cyclic loads over a period of life time is an important phenomenon for the life-cycle analysis. Service loads are accentuated at the areas of stress concentration, mainly at the connection of components. Structural components unavoidably are affected by defects such as surface scratches, surface roughness and weld defects of random sizes, which usually occur during the manufacturing and handling process. These defects are shown to have an important effect on the fatigue life of the structural components by promoting crack initiation sites. The value of equivalent initial flaw size (EIFS) is calculated by using the back extrapolation technique and the Paris law of fatigue crack growth from results of fatigue tests. We try to analyze the effect of EIFS distribution in a multiple site damage (MSD) specimen by using the extended finite element method (XFEM). For the analysis, fatigue tests were conducted on the centrally-cracked specimens and MSD specimens.

• 한국건설관리학회논문집
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• 제15권1호
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• pp.39-50
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• 2014

글로벌 금융위기 이후 국내 건설산업이 급격하게 침체된 가운데 건축물 리모델링 시장에 점점 초점이 맞춰지고 있다. 건축물 리모델링은 주거환경을 크게 개선시킬 뿐만 아니라 각 세대별 전용면적 증가, 여유공간 내 수평 또는 별동 증축, 대형 평수의 세대분할을 통한 세대수 증가 및 일부 분양 가능 등 많은 장점을 가지고 있다. 그러나 국내 공동주택 리모델링 시장의 경우 각종 법규 및 사업추진 절차상의 문제점 때문에 리모델링 대상 물량이 적지 않은 수치임에도 불구하고 사업이 지지부진한 곳이 태반인 실정이다. 또한 공동주택 리모델링 사업 추진여부를 결정하는 사업성 검토 단계에서 대부분의 수익성 판단 모델로 사용되고 있는 순현재가치법(NPV)은 리모델링 사업이 가지고 있는 단계별 특성과 미래의 불확실성을 고려하지 않은 단점을 가지고 있다. 이에 본 연구는 전통적인 가치평가방법인 순현재가치법의 문제점을 개선하고, 사업이 진행됨에 따라 일어날 수 있는 불확실성을 고려한 실물옵션 이론 중 이항모델을 활용하여 기존 사업성 검토에서 쓰이는 순현재가치법을 보완하였으며, 공동주택 리모델링 실제 성공사례를 바탕으로 연구를 진행하여 보다 현실적이고 타당성 있는 사업성 검토를 하였다. 본 연구는 국내 공동주택 리모델링 시장 발전의 토대를 제공하고, 기존의 사업성 검토 및 경제성 평가의 문제점을 개선하여 그 타당성을 향상시킬 수 있을 것으로 기대된다.

• 헤리티지:역사와 과학
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• 제53권2호
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• pp.88-109
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• 2020

본 논문은 건조물 문화재를 대상으로 생산되는 다양한 정보들이 그 속성을 토대로 관리될 수 있도록 기록정보의 유형을 구분하고 유형별 기본 속성을 확인하는 것을 목적으로 하였다. 먼저, 건조물 문화재와 기록정보라는 용어의 구체적인 사용 현황을 법제도 중심으로 검토하였고, 본 논문에서 사용하는 용어의 개념을 구체적으로 정의하였다. 건조물 문화재는 문화재보호법의 기본 정의를 준용하여 '법적으로 지정된 유형문화재 중의 건조물'로 정의하였고, 건조물 문화재의 기록정보는 '문화재 보존·관리를 위하여 건조물 문화재의 실증적 현황을 전자적 방식으로 처리하여 표현한 모든 종류의 자료'로 정의하여 적용하였다. 다음으로 건조물 문화재 기록정보의 생산 현황을 법제도적 측면에서 검토하였다. 그 결과, 관련된 법제도가 위계적으로 구성되어 있는 점과 단일 사업에서 다양한 형태의 기록정보가 복합적으로 생산되고 있는 현황을 확인하였다. 나아가, 동일한 형태로 생산되는 기록정보일지라도 생산 목적과 방법에 따라 상이한 내용과 의미를 담고 있다는 점과 모든 기록정보를 포괄할 수 있는 분류가 부재하다는 점도 확인하였다. 마지막으로 기록정보 중 도면은 생산 목적 및 구체적 대상에 따라 세부유형이 구분되고 있는 것도 확인하였다. 이상의 검토 결과를 토대로, 본 논문에서는 기록정보의 형식과 속성을 일차적인 기준으로 적용하여, 건조물 문화재의 기록정보를 6개의 유형과 27개의 세부유형으로 구분하였다. 구체적으로는 기록정보의 언어적 형태, 차원, 시간적 속성, 그래픽 형식을 유형 구분을 위한 기준으로 적용하고, 유형별로 기록정보의 속성으로서 기록정보의 대상, 기록정보의 생산 목적, 기록정보의 생산 방식, 기록정보에 포함된 내용의 성격 및 구성 등을 종합적으로 검토하였다.

• 한국안전학회지
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• 제22권5호
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• pp.57-64
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• 2007

In the field of domestic construction demolition works, work process management system is left behind compared with that of several advanced countries such as US, Japan and UK. Especially, the problems regarding safety management are more serious in terms of the availability of safety manuals and law system. The analysis results fiom the questionnaire survey and interviews with demolition engineers indicated that current safety management practices in demolition works lack systematic approach and inappropriate in securing labors' safe working environment. In addition, field labors and managers strongly requested the improvement of safety educational system. Grounded upon the analyses results and investigations, suggestions were drawn for the establishment of advanced safety educational system.

• Architectural research
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• 제17권1호
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• pp.41-48
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• 2015

Early investigations focused mainly on manipulating the confinement effect to develop a reinforced concrete column with lateral hoops. Based on this legacy model, Li's model incorporated the additional confinement effect of a steel jacket. However, recent experiments on plain concrete cylinders with steel jackets revealed relatively large discrepancies in the estimates of strength enhancement and the post-peak behavior. Here, we describe a modified constitutive law for confined concrete with an unbonded external steel jacket in terms of three regions for the loading stage. We used a two-phase heterogeneous concrete model to simulate the uniaxial compression test of a $150mm{\times}300mm$ concrete cylinder with three thicknesses of steel jackets: 1.0 mm, 1.5 mm, and 2.0 mm. The proposed constitutive model was verified by a series of finite element analyses using a finite element program. The damaged plasticity model and extended Drucker-Prager model were applied and compared in terms of the level of pressure sensitivity for confinement in 3D. The proposed model yielded results that were in close agreement with the experimental results.